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The grid structure is an indoor space structure formed by connecting multiple rods according to a certain grid pattern according to nodes. It has the advantages of indoor space support, light weight, high bending rigidity, and good seismic performance; it can be used as stadiums, movie theaters, exhibition halls, waiting halls, stadium canopies, hangars, double-pillar grid structures away from the production workshop The roof truss of other engineering constructions. The disadvantage is that the total number of rods converging on the node is large, and the production and installation are more complicated than the plan structure.

The truss structure is a plan view or indoor space structure generally equipped with triangular modules composed of straight rods. Under the load effect, the truss structure members key bear the radial tensile force or working pressure, and then can flexibly use the compressive strength of the raw materials. When the span is large, compared with the solid web beam, the raw material is saved, the weight is reduced, and the bending rigidity is enlarged. Therefore, it is suitable for large-span load-carrying structures and towering structures, such as steel roof trusses, highway bridges, power line towers, communication satellite transmission towers, water conservancy gates, lifting equipment racks, etc.

Compared with the grid structure, the tubular truss structure saves the vertical members of the lower chord and the spherical joints of the spherical grid. Various regulations of different architectural forms can be considered, especially the construction of round arches and random curves are better than the grid. The structure is more advantageous. The reliability is the same in all directions, saving the amount of raw materials used. The seamless steel tube truss structure is based on the basic development trend of the grid structure.

Compared with the grid structure, it has its unique advantages and applicability, and the steel content of the structure is also more economical.

Compared with the traditional open cross-section (H-shaped steel and I-shaped steel) steel pipe truss, the raw materials of the pipe truss structure are more evenly distributed around the central joint axis, so that the cross-section has excellent compressive strength and bending strength and torsion bearing capacity. And the big bending stiffness, no gusset plate, simple structure, the key is that the appearance design of the tubular truss structure is beautiful and generous, which is conducive to the design of the shape and has a certain practical effect of the decorative design. Truss

The overall performance of the frame structure is good, the torsion and bending rigidity is large, and the surface is beautiful and generous. It is very easy to manufacture, install, turn over and hoist; the seamless steel pipe steel roof truss made of cold drawn thick-wall channel steel has light structure and bending rigidity Good, save the stainless steel plate, and can make full use of the advantages of raw material compressive strength, especially the selection of the pressure rod and support point system software controlled by the slenderness ratio is more economical.

At this stage, the housing construction foundation of this type of structure belongs to commercial buildings. The structure has the characteristics of beautiful and generous shape design (completed tablet shape, circular arc shape, random curve shape), convenient manufacture and installation, good structural reliability, large bending rigidity of the roof truss, and easy to use for economic development.